Somebody knows a clear tutorial of how deploy a react solidity app in eth mainnet? I know is something basic but I started one week ago 😌

Is just a matter of change the networkID? What about the fees to deploy the smart contracts?

let's focus on solidity part

Of course the fees will change based on the current chain

Which is the best chain now? I see eth fees are improving with 2.0 and pos

Solana maybe the cheapest but is it trustworthy? I have some investments there but I know the problems with the network

if you mean which is the cheapest chain

for L2 check this
https://l2fees.info/

I suppose to have the biggest scope in terms of creating a market around the product/service we want to sell is better to choose ethereum, what do you think?

Can't give financial advice

DYOR

So nobody knows a good tutorial for this?

Search YouTube there are TONS of tutorials. No one here will answer basic questions tbh. If it can be found on the first page of google results people usually scroll past your question

Something like dapp university has some that you can follow very easily